Performance Calculation
After evaluating some different tools for the weight
and balance report, performance, and fuel
calculation I got stuck with TOPCAT. For me TOPCAT
is the most advanced program for Weight and Balance,
Take-Off and Landing Performance calculation. In
addition it does also a basic fuel calculation which
is very close to the actual consumption.

Weight and Balance tab card of TOPCAT for a
flight from Cologne (EDDK) to
London Gatwick (EGKK)

Click the icon to see the Weight and Balance Tab
Card full size.

TOPCAT calculates the ZFW by means of the
dry operating weight (DOW), and payload. During flight preparation ZWF is
entered by the pilot into
the .PERF INIT page of the
CDU.